Which of the following is an exact number?
A) the number of milligrams in a gram
B) the number of meters in a kilometer
C) the number of micrometers in a centimeter
D) the number of cubic centimeters in a liter
E) All of the above are exact numbers.

Question

Quizplus · Accepted Answer

All of the choices represent defined unit conversions within the metric system, making them exact numbers by definition. These are not measured quantities but are defined values: 1000 milligrams in a gram, 1000 meters in a kilometer, 10,000 micrometers in a centimeter, and 1000 cubic centimeters in a liter.

Which of the Following Is an Exact Number